Problem- A reservoir containing retrograde gas has a reservoir pressure higher than the dew-point pressure of the gras as evidenced by constant producing gas-oil ratio. The gas is produced through three stages of seperation. Surface production rates, specific gravities, and conditions are given below:
Gas rate (scf/STB) Gas specific gravity Temp. (F) Pressure (psia)
Primary seperator 4187 .666 105 650
Second seperator 334 .946 95 70
Stonck tank 88 1.546 90 14.7
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Stock-tank oil gravity is 55.2 (degrees) API. Calculate the specific gravity of the reservoir gas.
Separate your answers with a comma. Show the process and each step.